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Q.

Let α,β be the roots of the equation x2-2x+6=0 and 1α2+1,1β2+1 be  the roots of the equation x2+ax+b=0. Then the roots of the equation x2-a+b-2x+a+b+2=0 are

 

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a

non-real complex numbers

b

real and both negative

c

real and both positive

d

real and exactly one of them is positive

answer is B.

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Detailed Solution

a=-1α2-1β2-2,  b=1α2+1β2+1+1α2β2 a+b=1αβ2-1=16-1=-56 x2--56-2x+2-56=0 6x2+17x+7=0 6x2+3x+14x+7=0 3x(2x+1)+7(2x+1)=0 x=-73, x=-12 are the roots Both roots are real and negative. 

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